Google Unit Cuts the Price of Moto X Phone

Move Continues the Assault on Its Rivals' High Margins

Google Inc.'s Motorola Mobility unit dropped the price on its flagship smartphone Wednesday, continuing its assault on the high margins of its smartphone rivals.

In a blog post, the company said its Moto X with 16 gigabytes of memory would now cost $399 without a wireless contract for U.S. customers, down from $550. The company offered the Moto X for brief periods in December at $349, but the latest price drop isn't a temporary...